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x in (-oo:+oo)
y+4 = (-1/3)*(x-1) // - (-1/3)*(x-1)
y-((-1/3)*(x-1))+4 = 0
(1/3)*(x-1)+y+4 = 0
1/3*(x-1)+y+4 = 0
1/3*(x-1)+y+4 = 0
1/3*x+y-1/3+4 = 0
1/3*x+y+11/3 = 0
1/3*x+y+11/3 = 0
1/3*x+y+11/3 = 0 // - y+11/3
1/3*x = -(y+11/3) // : 1/3
x = (-(y+11/3))/1/3
x = -3*(y+11/3)
x = -3*(y+11/3)
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